Garnet Is More Than Red: Tsavorite, Rhodolite and Spessartite

Garnet gemstone colours run from green tsavorite to orange spessartite and raspberry rhodolite. What each variety is, how it wears, and where value sits.

Most people picture garnet as a dark, slightly brownish red, the stone of Victorian brooches and birthstone charms. That garnet exists and is inexpensive. It is also the least interesting member of a family whose garnet gemstone colours include a green that rivals emerald, a bright mandarin orange, and a raspberry red that costs a fraction of ruby.

Garnet is not one mineral. It is a group of related silicates that share a crystal structure and swap elements freely. The colour depends on which elements are present.

The basics that apply to all garnets

Hardness. 6.5 to 7.5 on the Mohs scale depending on variety. The greens and oranges sit at the harder end. Suitable for rings with protected settings, and for all other jewellery without concern.

Treatment. Garnet is essentially never treated. What you see is natural, which simplifies buying considerably.

Singly refractive. Like spinel and diamond, which gives garnet a clean, crisp look under magnification.

Pleochroism. None, so colour is consistent from every direction, a practical advantage for cutters.

Tsavorite

A green grossular garnet coloured by vanadium and chromium, discovered in Tanzania and Kenya in the 1960s and named for the Tsavo region. The colour ranges from yellowish green to a saturated bluish green that competes directly with emerald.

Why it matters. Tsavorite is harder than emerald, almost always cleaner, and untreated. Emerald is routinely oiled; tsavorite is not.

Size. Crystals are small. Clean stones above two carats are uncommon and priced accordingly. Above five carats they are rare.

Value. Fine tsavorite is the most expensive garnet and competes with good emerald per carat in smaller sizes, though it remains cheaper at any given quality.

Rhodolite

A mix of pyrope and almandine garnet, rhodolite is a purplish red to raspberry pink. It is the garnet that surprises people who expected brown.

What to look for. A clean, bright raspberry without brown or too much dark. The best material is from East Africa and Sri Lanka.

Value. Widely available in clean stones of several carats at moderate prices. Rhodolite is perhaps the best value red-to-pink stone for jewellery in its hardness class.

In settings. Suits both white and rose gold. Cut shallow, it stays bright; cut deep, it darkens.

Spessartite

Manganese garnet, ranging from orange-red through to a pure vivid orange. The finest orange stones, once marketed as mandarin garnet, came from Namibia and Nigeria.

What to look for. A saturated orange without brown. Most spessartite is somewhat included; a clean, bright stone commands a premium.

Value. Fine orange stones are priced well above rhodolite and below tsavorite.

In jewellery. Orange is a strong colour that works best as a single accent stone or in yellow gold, where it glows rather than fights.

Other garnets worth knowing

Demantoid. A rare green andradite garnet with dispersion higher than diamond, historically from Russia. Collectors' territory.

Malaia or Malaya. Peach to pinkish orange, a pyrope-spessartite blend, subtle and increasingly popular.

Colour-change garnet. Shifts from greenish or bluish in daylight to red or purple under incandescent light. Rare and fascinating.

Almandine and pyrope. The dark reds of tradition. Inexpensive, hard-wearing, and handsome when cut shallow enough to let light through.

Choosing a garnet

Decide on colour first, then variety. Ask for the variety name on any invoice, because "garnet" alone tells you nothing about value. Buy tsavorite and spessartite from sellers who will provide a laboratory report for significant stones. For rhodolite and the traditional reds, a reputable jeweller's word and a good look under daylight are usually sufficient.

Garnet's lack of treatment, its range of colours and its honest pricing make it one of the most rewarding stones to design around, and one of the least understood.

Book a complimentary design consultation at the C'Garden atelier, The MET Corporate Towers, Kuala Lumpur: 010-766 7448 · hq@cgarden.com.my

C'Garden is an independent bespoke jeweller in Kuala Lumpur. We are not affiliated with, endorsed by, sponsored by or certified by any organisation, laboratory or brand named in this article. Third-party names are used only to refer factually to those organisations and their published standards. All text and imagery in this article is original work created by C'Garden.

Reference

Gemological Institute of America. (n.d.). Garnet. GIA. https://www.gia.edu/garnet